4,469 research outputs found
Concorso di idee: Progettazione della nuova sede del municipio e spazi urbani attigui - Paratico (BG)
No full textComune di Paratico (BG), Concorso di idee: Progettazione della nuova sede del municipio e spazi urbani attigui.
Marco Bovati (capogruppo). Con: Valentino Barbu Michielin, Davide Ferrari, Marco Grazioli
Narrare la città: alla ricerca dell’identità novarese
No full textIl saggio che apre il volume "Narrare la città. Tratti identitari, linguistici e memoria della tradizione a Novara" offre uno sguardo sul tema dell’identità locale. Al di là del senso comune, la ricerca è un contributo scientifico volto a definire e a sostanziare il concetto di “novaresità”. Il quadro dei tratti identitari della gente di Novara è il risultato di una complessa indagine condotta dal Dipartimento di Studi Umanistici dell’Università del Piemonte Orientale “Amedeo Avogadro” e dall'Università di Scienze Gastronomiche e promossa dalla Fondazione Banca Popolare di Novara per il Territorio e dalla Fondazione Comunità del Novarese.
L’indagine si è avvalsa di avanzate metodologie scientifiche qualitative e quantitative per investigare i tratti identitari, linguistici e la memoria della tradizione della città.
L’analisi dei dati raccolti offre un interessante quadro cognitivo che non imprigiona l’essenza dell’identità entro schemi, definizioni e classificazioni non sempre pertinenti all'intelligenza del presente; vuole invece evidenziare e rendere trasparente il complesso sistema affettivo che lega i novaresi alla loro terra, al loro dialetto, alle loro tradizioni. L’esito della ricerca è una ricchezza culturale che ricostruisce il passato di Novara, ne definisce il presente ed è strumento essenziale per pensare il futuro della città.
Al volume hanno collaborato: Fabio Bailo, Cesare Emanuel, Gianpaolo Fassino, Giacomo Ferrari, Michele Filippo Fontefrancesco, Paolo Garbarino, Piercarlo Grimaldi, Maurizio Leigheb, Aldo Martelli, Carlo Petrini, Davide Porporato, Marco Salamon
The Maximum Lq-Likelihood Estimator in Extreme Value Theory, Italian
No full textIn questo lavoro, si propone di utilizzare lo stimatore MLqE di Massima Lq-Verosimiglianza, introdotto da Ferrari e Yang (2007), per la stima dei parametri della distribuzione del Valore Estremo generalizzata e della distribuzione di Pareto generaliz- zata. L’analisi empirica, condotta mediante simulazioni Monte Carlo, mostra che lo sti- matore MLqE e ́ piu ́ efficiente dello stimatore di Massima Verosimiglianza nel caso in cui si voglia stimare la probabilita ́ di un evento estremo, avendo a disposizione un campione di dimensioni limitate
Some counterexamples to Alt–Caffarelli–Friedman monotonicity formulas in Carnot groups
Full text linkIn this paper we continue the analysis of an Alt-Caffarelli-Friedman (ACF) monotonicity formula in Carnot groups of step s >1 confirming the existence of counterexamples to the monotone increasing behavior. In particular, we provide a sufficient condition that implies the existence of some counterexamples to the monotone increasing behavior of the ACF formula in Carnot groups.
The main tool is based on the lack of orthogonality of harmonic polynomials in Carnot groups. This paper generalizes the results proved in n Ferrari and Forcillo (Atti Accad
Naz Lincei Rend Lincei Mat Appl 34(2):295–306, 2023)
Estimation of Tail Probability via the Maximum Lq-Likelihood method
Full text link1 online resource (PDF, 36 pages)Ferrari, Davide; Yang, Yuhong. (2007). Estimation of Tail Probability via the Maximum Lq-Likelihood method. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/199669
The Maximum Lq-likelihood method: an application to extreme quantile estimation in finance
No full textEstimating financial risk is a critical issue for banks and insurance companies.Recently, quantile estimation based on extreme value theory (EVT) has founda successful domain of application in such a context, outperforming other methods.Given a parametric model provided by EVT, a natural approach is maximumlikelihood estimation. Although the resulting estimator is asymptotically efficient,often the number of observations available to estimate the parameters of the EVTmodels is too small to make the large sample property trustworthy. In this paper,we study a new estimator of the parameters, the maximum Lq-likelihood estimator(MLqE), introduced by Ferrari and Yang (Estimation of tail probability via themaximum Lq-likelihood method, Technical Report 659, School of Statistics, Universityof Minnesota, 2007 http://www.stat.umn.edu/~dferrari/research/techrep659.pdf).We show that the MLqE outperforms the standard MLE, when estimating tail probabilitiesand quantiles of the generalized extreme value (GEV) and the generalizedPareto (GP) distributions. First, we assess the relative efficiency between the MLqEand the MLE for various sample sizes, using Monte Carlo simulations. Second, weanalyze the performance of the MLqE for extreme quantile estimation using realworldfinancial data. The MLqE is characterized by a distortion parameter q andextends the traditional log-likelihood maximization procedure. When q different from 1, thenew estimator approaches the traditional maximum likelihood estimator (MLE),recovering its desirable asymptotic properties; when q = 1 and the sample size ismoderate or small, the MLqE successfully trades bias for variance, resulting in anoverall gain in terms of accuracy (mean squared error)
SAPIENSSII. Strumento per L'Autovalutazione dei Processi Interculturali in Educazione nella Scuola Secondaria di Secondo Grado
No full textIl volume, che discute il tema dell'autovalutazione dei processi educativi interculturali nella scuola secondaria di secondo grado italiana, è composto da una parte cartacea e da un allegato on line. Nella parte cartacea, Monica Ferrari firma i capitoli 2 e 5 ;cofirma con Filippo Ledda i capitoli 1 e 4. Il capitolo 3 della parte cartacea è a firma di Filippo Ledda. Nell'allegato on line Ferrari firma il capitolo 1, Ledda il 2. Davide Guido, Mario Grassi e Filippo Ledda firmano l'appendice dell'allegato on line
Nonlinear Multi-Frequency Converter Array for Vibration Energy Harvesting in Autonomous Sensors
No full textAbstractThis work proposes and experimentally validates a vibration energy harvester which combines the multi-frequency and nonlinear approaches into a converter array. The converter array consists of four piezoelectric cantilevers composed of ferromagnetic substrates with screen-printed lead zirconate titanate (PZT) layers coupled with a single permanent magnet elastically suspended on the array base in order to create a nonlinear behaviour. The presence of a moving magnet and the possibility to realize cantilevers with different potential curves can be useful to obtain a collective nonlinear behaviour due to strong coupling irrespective of the amplitude of the mechanical excitation, therefore increasing the overall effectiveness of the converter array. The experimental results confirm that combining cantilevers with different potential curves can be useful to obtain a collective bistable behaviour, therefore increasing the overall effectiveness of the converter array
Estimation of Tail Probability via the Maximum Lq-Likelihood Method
No full textEstimation of tail probability is of interest in various applications. Given a parametric model, a natural approach is maximum likelihood estimationAlthough the resulting estimator is asymptotically efficient, the large sam-ple property is often not trustworthy for estimating small tail probabilities.We introduce a new estimator for the parameters, the Maximum Lq-Like-lihood Estimator (MLqE), based on Havrda and Charv·t entropy function
Box-Ball System: Soliton and Tree Decomposition of Excursions
Full text linkWe review combinatorial properties of solitons of the Box-Ball system introduced by Takahashi and Satsuma (J Phys Soc Jpn 59(10):3514–3519, 1990). Starting with several definitions of the system, we describe ways to identify solitons and review a proof of the conservation of the solitons under the dynamics. Ferrari et al. (Soliton decomposition of the box-ball system (2018). arXiv:1806.02798) proposed a soliton decomposition of a configuration into a family of vectors, one for each soliton size. Based on this decompositions, the authors (Ferrari and Gabrielli, Electron. J. Probab. 25, Paper No. 78–1, 2020) propose a family of measures on the set of excursions which induces invariant distributions for the Box-Ball System. In the present paper, we propose a new soliton decomposition which is equivalent to a branch decomposition of the tree associated to the excursion, see Le Gall (Une approche élémentaire des théorèmes de décomposition de Williams. In: Séminaire de Probabilités, XX, 1984/85, vol. 1204, pp. 447–464. Lecture Notes in Mathematics. Springer, Berlin (1986)). A ball configuration distributed as independent Bernoulli variables of parameter λ < 1∕2 is in correspondence with a simple random walk with negative drift 2λ − 1 and having infinitely many excursions over the local minima. In this case the soliton decomposition of the walk consists on independent double-infinite vectors of iid geometric random variables (Ferrari and Gabrielli, Electron. J. Probab. 25, Paper No. 78–1, 2020). We show that this property is shared by the branch decomposition of the excursion trees of the random walk and discuss a corresponding construction of a Geometric branching process with independent but not identically distributed Geometric random variables.Fil: Ferrari, Pablo Augusto. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Investigaciones Matemáticas "Luis A. Santaló". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Matemáticas "Luis A. Santaló"; ArgentinaFil: Gabrielli, Davide. Universita degli Studi dell'Aquila; ItaliaXIII Symposium on Probability and Stochastic ProcessesMéxicoUniversidad Nacional Autónoma de Méxic
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